The First Four Years is a book written by Laura Ingalls Wilder which Roger Lea MacBride found in the belongings of her daughter Rose Wilder Lane while going through Rose's estate after her death in 1968. Laura wrote all of her books in pencil on dime store tablets, and the manuscript of The First Four Years was found in manuscript form as Laura had written it.

It is not clear whether Laura intended this first draft to be a ninth book in her Little House on the Prairie series, or possibly a standalone novel for adults; much of the material is more for an adult audience than anything in her Little House books. She seems to have written the extant first draft sometime around 1940, and then apparently lost interest in the project. Roger MacBride, the adopted grandson of Rose Wilder Lane, and executor of her estate, made a decision to publish The First Four Years without any editing (except for minor spelling errors) so it came directly from Laura's pencil to the written page. Because Laura never reworked the manuscript - and Rose never edited it as she had her mother's previously published works, The First Four Years is less polished in style than the books of the Little House series, but it is still unmistakably Laura's writing.

The First Four Years gets its title from a promise Laura made to Almanzo when they became engaged. Laura did not want to be a farmer's wife, but decided to try farming for three years.

Laura keeps house and Manly tends the land and the stock, and they go on frequent pony rides together. At the end of the first year, just as the wheat is ready to harvest, a serious hailstorm destroys the entire crop, which would have brought them approximately three thousand dollars and paid off their debts on farm equipment and the building of the house.

Faced with mounting debt, Manly decides to mortgage the homestead claim. He and Laura will have to live on it as a condition of the mortgage, so they rent out the house on the tree claim and Manly builds a small home on the homestead claim. Their daughter Rose is born there in December. At the end of the second year, they harvest a fair wheat crop,and share the proceeds of the sale of the wheat with the tree claim's renter, making enough money themselves to pay some of their smaller debts.

In December of the third year, both Laura and Manly contract diphtheria, and Manly suffers a complication which leaves him permanently physically impaired. The renter decides to move away, and as Manly can no longer work both pieces of land, they sell the homestead claim and move back to their first house.

Laura receives an opportunity to invest money in a flock of sheep. The wool from the sheep repays Laura's initial investment with enough left over only for the interest on their debts. Meanwhile, the wheat and oats grow well, but are ruined just before harvest when several days of hot, dry wind damage them irreparably prior to harvest.

At the end of the third year, though farming has not yet been a success, Laura and Manly agree to continue for one more year, a "year of grace", in Laura's words, since they have no other prospects and Manly believes they just need one good year to turn things around. Unfortunately, hot winds again ruin the next planting of wheat and oats. Their unnamed son is born in August but dies a few weeks later. Finally, their house is destroyed by a flash fire.

Despite this, the book ends at the close of the fourth year on an optimistic note, with Laura feeling hopeful that their luck will turn. In reality, continual debt and the hot, dry Dakota summers drove Laura and Manly from their land; but they later settled in Missouri, founding a very successful fruit and dairy farm where they lived comfortably until their respective deaths.